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                Control                </h1>
                <p>时间限制：15s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p><span style="font-size: medium">小x励志当一名医生。某年某月某日，在A市爆发了一场疫情。病毒繁衍地非常快，每个病<br />
人病情的严重程度可以用一个非负整数来衡量。这个城市有n个病人。在小x刚到达这个城市的时<br />
候，每个病人的病情可以用b表示。每过一个时刻，病人的病情会增加a。注意上面所述的a、b对<br />
每一个病人不一定相同。救治一个病情严重程度为x的病人，小x需要消耗x点体力。小x刚到达<br />
这个城市的时候就可以开始救治。<br />
&nbsp;&nbsp;&nbsp; 有些时候，小x会带来一瓶超级药水，在他到达这个城市的时候可以给某个病人服下（不消耗<br />
时间，也不一定要最先救治这个病人），那么这个病人的b值会变成0。<br />
&nbsp;&nbsp;&nbsp; 只要成功救治了p个病人，就可以认为病情稳定，小x就可以休息了。问小x最少需要消耗多少<br />
体力。<br />
</span></p></p><hr/><h3>输入格式</h3><p><p><font size="4">第一行有3个整数n、p、k，其中n、p的含义如题面。若k为0，则小x没<br />
带超级药水；否则小x带了超级药水。<br />
接下去n行，每行有两个非负整数a、b，表示一个病人的a、b值。<br />
</font></p></p><hr/><h3>输出格式</h3><p><p><font size="4">仅包含一个整数，表示小x的最小体力花费。<br />
</font></p></p><hr/><h3>样例输入</h3><pre>3 3 0
1 0
2 1
3 2
</pre><hr/><h3>样例输出</h3><pre>7</pre><hr/><h3>提示</h3><p><p><span style="font-size: medium">l &lt;= n &lt;= 100000,l &lt;= P&lt;= n,O&lt;k&lt;l,0 &lt; a &lt; 10^7,0 &lt; B &lt;&nbsp; 10^12</span></p></p><hr/><h3>题目来源</h3><p>By xyz111</p>
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